“Stop the fucken car” - the car was stopped when the officer shot him (he was shot 7 seven seconds after the officer got out of his patrol car according to the official report).
“Don’t pull out a fucken knife on an officer.” - the man was still inside his car with the doors closed and windows rolled up and as per Pennsylvania law, it is legal to have a knife out and in the open in your vehicle. Assuming the man intended to use the knife against the officer, I beg you to give a scenario in which the man could stab his knife through the car door and injur the officer. If you say something like “well, he could have gotten out of his car and stabbed the cop hur dur dur.” Then just save your breath. We could argue all day about what could have happened. The fact is, it didn’t. The man didn’t get out of his car to attack the officer with the knife, and the officer wasn’t in danger. End of story.